Changes between Version 139 and Version 140 of wireless/modem

Timestamp:

11/20/2025 08:21:31 PM (7 weeks ago)

Author:

Ryan Erbstoesser

Comment:

add binding notes and gpio notes for fn920

wireless/modem

@@ -2110 +2110 @@
 == Telit FN920 PCIe Mode
 
-The Telit FN920C04 supports PCIe, which is new for modems. PCIe is valuable for faster bus speeds compared to USB. This requires a new MHI driver only in latest kernels (6.12+) available on Venice SBCs. Contact Gateworks support for other board families.  
+The Telit FN920C04 (5G RedCap) supports PCIe, which is new for modems. PCIe is valuable for faster bus speeds compared to USB. This requires a new MHI driver only in latest kernels (6.12+) available on Venice SBCs. Contact Gateworks support for other board families.  
+
+Telit information: [https://www.telit.com/devices/fn920c04/]
 
 Requirements:
@@ -2127 +2129 @@
 MHI_WWAN_CTRL
 }}}
+
+
+Pin 20 Selection:
+ - On the M.2 needs slot, pin 20 needs to be low for PCIe mode (open or high for USB mode)
+ - GPIO discussion here: [#M.2Pin2022Details here]
+ - FSA for VeniceFLEX / Catalina here: [wiki:FSA#GW16FB0FSAM.2B-KeyAdapter]
+ - GW16147 Mini-PCIe to B-Key M.2 Adapter pulls pin 20 low by default, there is no GPIO control
 
 These can be found on a live running system with the following example:
@@ -2214 +2223 @@
 }}}
 
-=== Troubleshooting
- * Be sure the modem PCIe ID is included the the MHI PCIe driver (kernel commit by Telit in 6.16 kernel [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/bus/mhi/host/pci_generic.c?id=6348f62ef7ecc5855b710a7d4ea682425c38bb80 here])
+=== FN920 Troubleshooting
+ * Be sure the modem PCIe ID is included the the MHI PCIe driver (kernel commit by Telit in 6.16 kernel [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/bus/mhi/host/pci_generic.c?id=6348f62ef7ecc5855b710a7d4ea682425c38bb80 here]) 
+  * If device ID is not in driver, the driver won't bind to the PCIe device, use lspci --vv to see the binding like below:
+{{{
+03:00.0 Unassigned class [ff00]: Qualcomm Technologies, Inc Device 011a
+        Subsystem: Device 1c5d:2020
+        Physical Slot: 0
+        Flags: fast devsel, IRQ 222
+        Memory at 18100000 (64-bit, non-prefetchable) [size=4K]
+        Memory at 18101000 (64-bit, non-prefetchable) [size=4K]
+        Capabilities: [40] Power Management version 3
+        Capabilities: [50] MSI: Enable+ Count=8/32 Maskable+ 64bit+
+        Capabilities: [70] Express Endpoint, MSI 00
+        Capabilities: [100] Advanced Error Reporting
+        Capabilities: [148] Secondary PCI Express
+        Capabilities: [158] Transaction Processing Hints
+        Capabilities: [1e4] Latency Tolerance Reporting
+        Capabilities: [1ec] L1 PM Substates
+        Capabilities: [1fc] Vendor Specific Information: ID=0002 Rev=4 Len=100 <?>
+        Kernel driver in use: mhi-pci-generic
+        Kernel modules: mhi_pci_generic
+}}}
  * Be sure pin 20 is pulled low for Mini-PCIe mode
  * Be sure all MHI related drivers are turned on in the kernel